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1// SPDX-License-Identifier: GPL-2.02/*3 * resource.c - Contains functions for registering and analyzing resource information4 *5 * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>6 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>7 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.8 * Bjorn Helgaas <bjorn.helgaas@hp.com>9 */10 11#include <linux/module.h>12#include <linux/slab.h>13#include <linux/errno.h>14#include <linux/interrupt.h>15#include <linux/kernel.h>16#include <asm/io.h>17#include <asm/dma.h>18#include <asm/irq.h>19#include <linux/pci.h>20#include <linux/libata.h>21#include <linux/ioport.h>22#include <linux/init.h>23 24#include <linux/pnp.h>25#include "base.h"26 27static int pnp_reserve_irq[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some IRQ */28static int pnp_reserve_dma[8] = {[0 ... 7] = -1 }; /* reserve (don't use) some DMA */29static int pnp_reserve_io[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some I/O region */30static int pnp_reserve_mem[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some memory region */31 32/*33 * option registration34 */35 36static struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,37 unsigned int option_flags)38{39 struct pnp_option *option;40 41 option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);42 if (!option)43 return NULL;44 45 option->flags = option_flags;46 option->type = type;47 48 list_add_tail(&option->list, &dev->options);49 return option;50}51 52int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,53 pnp_irq_mask_t *map, unsigned char flags)54{55 struct pnp_option *option;56 struct pnp_irq *irq;57 58 option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);59 if (!option)60 return -ENOMEM;61 62 irq = &option->u.irq;63 irq->map = *map;64 irq->flags = flags;65 66#ifdef CONFIG_PCI67 {68 int i;69 70 for (i = 0; i < 16; i++)71 if (test_bit(i, irq->map.bits))72 pcibios_penalize_isa_irq(i, 0);73 }74#endif75 76 dbg_pnp_show_option(dev, option);77 return 0;78}79 80int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,81 unsigned char map, unsigned char flags)82{83 struct pnp_option *option;84 struct pnp_dma *dma;85 86 option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);87 if (!option)88 return -ENOMEM;89 90 dma = &option->u.dma;91 dma->map = map;92 dma->flags = flags;93 94 dbg_pnp_show_option(dev, option);95 return 0;96}97 98int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags,99 resource_size_t min, resource_size_t max,100 resource_size_t align, resource_size_t size,101 unsigned char flags)102{103 struct pnp_option *option;104 struct pnp_port *port;105 106 option = pnp_build_option(dev, IORESOURCE_IO, option_flags);107 if (!option)108 return -ENOMEM;109 110 port = &option->u.port;111 port->min = min;112 port->max = max;113 port->align = align;114 port->size = size;115 port->flags = flags;116 117 dbg_pnp_show_option(dev, option);118 return 0;119}120 121int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags,122 resource_size_t min, resource_size_t max,123 resource_size_t align, resource_size_t size,124 unsigned char flags)125{126 struct pnp_option *option;127 struct pnp_mem *mem;128 129 option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);130 if (!option)131 return -ENOMEM;132 133 mem = &option->u.mem;134 mem->min = min;135 mem->max = max;136 mem->align = align;137 mem->size = size;138 mem->flags = flags;139 140 dbg_pnp_show_option(dev, option);141 return 0;142}143 144void pnp_free_options(struct pnp_dev *dev)145{146 struct pnp_option *option, *tmp;147 148 list_for_each_entry_safe(option, tmp, &dev->options, list) {149 list_del(&option->list);150 kfree(option);151 }152}153 154/*155 * resource validity checking156 */157 158#define length(start, end) (*(end) - *(start) + 1)159 160/* Two ranges conflict if one doesn't end before the other starts */161#define ranged_conflict(starta, enda, startb, endb) \162 !((*(enda) < *(startb)) || (*(endb) < *(starta)))163 164#define cannot_compare(flags) \165((flags) & IORESOURCE_DISABLED)166 167int pnp_check_port(struct pnp_dev *dev, struct resource *res)168{169 int i;170 struct pnp_dev *tdev;171 struct resource *tres;172 resource_size_t *port, *end, *tport, *tend;173 174 port = &res->start;175 end = &res->end;176 177 /* if the resource doesn't exist, don't complain about it */178 if (cannot_compare(res->flags))179 return 1;180 181 /* check if the resource is already in use, skip if the182 * device is active because it itself may be in use */183 if (!dev->active) {184 if (!request_region(*port, length(port, end), "pnp"))185 return 0;186 release_region(*port, length(port, end));187 }188 189 /* check if the resource is reserved */190 for (i = 0; i < 8; i++) {191 int rport = pnp_reserve_io[i << 1];192 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;193 if (ranged_conflict(port, end, &rport, &rend))194 return 0;195 }196 197 /* check for internal conflicts */198 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {199 if (tres != res && tres->flags & IORESOURCE_IO) {200 tport = &tres->start;201 tend = &tres->end;202 if (ranged_conflict(port, end, tport, tend))203 return 0;204 }205 }206 207 /* check for conflicts with other pnp devices */208 pnp_for_each_dev(tdev) {209 if (tdev == dev)210 continue;211 for (i = 0;212 (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));213 i++) {214 if (tres->flags & IORESOURCE_IO) {215 if (cannot_compare(tres->flags))216 continue;217 if (tres->flags & IORESOURCE_WINDOW)218 continue;219 tport = &tres->start;220 tend = &tres->end;221 if (ranged_conflict(port, end, tport, tend))222 return 0;223 }224 }225 }226 227 return 1;228}229 230int pnp_check_mem(struct pnp_dev *dev, struct resource *res)231{232 int i;233 struct pnp_dev *tdev;234 struct resource *tres;235 resource_size_t *addr, *end, *taddr, *tend;236 237 addr = &res->start;238 end = &res->end;239 240 /* if the resource doesn't exist, don't complain about it */241 if (cannot_compare(res->flags))242 return 1;243 244 /* check if the resource is already in use, skip if the245 * device is active because it itself may be in use */246 if (!dev->active) {247 if (!request_mem_region(*addr, length(addr, end), "pnp"))248 return 0;249 release_mem_region(*addr, length(addr, end));250 }251 252 /* check if the resource is reserved */253 for (i = 0; i < 8; i++) {254 int raddr = pnp_reserve_mem[i << 1];255 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;256 if (ranged_conflict(addr, end, &raddr, &rend))257 return 0;258 }259 260 /* check for internal conflicts */261 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {262 if (tres != res && tres->flags & IORESOURCE_MEM) {263 taddr = &tres->start;264 tend = &tres->end;265 if (ranged_conflict(addr, end, taddr, tend))266 return 0;267 }268 }269 270 /* check for conflicts with other pnp devices */271 pnp_for_each_dev(tdev) {272 if (tdev == dev)273 continue;274 for (i = 0;275 (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));276 i++) {277 if (tres->flags & IORESOURCE_MEM) {278 if (cannot_compare(tres->flags))279 continue;280 if (tres->flags & IORESOURCE_WINDOW)281 continue;282 taddr = &tres->start;283 tend = &tres->end;284 if (ranged_conflict(addr, end, taddr, tend))285 return 0;286 }287 }288 }289 290 return 1;291}292 293static irqreturn_t pnp_test_handler(int irq, void *dev_id)294{295 return IRQ_HANDLED;296}297 298#ifdef CONFIG_PCI299static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci,300 unsigned int irq)301{302 u32 class;303 u8 progif;304 305 if (pci->irq == irq) {306 pnp_dbg(&pnp->dev, " device %s using irq %d\n",307 pci_name(pci), irq);308 return 1;309 }310 311 /*312 * See pci_setup_device() and ata_pci_sff_activate_host() for313 * similar IDE legacy detection.314 */315 pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);316 class >>= 8; /* discard revision ID */317 progif = class & 0xff;318 class >>= 8;319 320 if (class == PCI_CLASS_STORAGE_IDE) {321 /*322 * Unless both channels are native-PCI mode only,323 * treat the compatibility IRQs as busy.324 */325 if ((progif & 0x5) != 0x5)326 if (ATA_PRIMARY_IRQ(pci) == irq ||327 ATA_SECONDARY_IRQ(pci) == irq) {328 pnp_dbg(&pnp->dev, " legacy IDE device %s "329 "using irq %d\n", pci_name(pci), irq);330 return 1;331 }332 }333 334 return 0;335}336#endif337 338static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)339{340#ifdef CONFIG_PCI341 struct pci_dev *pci = NULL;342 343 for_each_pci_dev(pci) {344 if (pci_dev_uses_irq(pnp, pci, irq)) {345 pci_dev_put(pci);346 return 1;347 }348 }349#endif350 return 0;351}352 353int pnp_check_irq(struct pnp_dev *dev, struct resource *res)354{355 int i;356 struct pnp_dev *tdev;357 struct resource *tres;358 resource_size_t *irq;359 360 irq = &res->start;361 362 /* if the resource doesn't exist, don't complain about it */363 if (cannot_compare(res->flags))364 return 1;365 366 /* check if the resource is valid */367 if (*irq > 15)368 return 0;369 370 /* check if the resource is reserved */371 for (i = 0; i < 16; i++) {372 if (pnp_reserve_irq[i] == *irq)373 return 0;374 }375 376 /* check for internal conflicts */377 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {378 if (tres != res && tres->flags & IORESOURCE_IRQ) {379 if (tres->start == *irq)380 return 0;381 }382 }383 384 /* check if the resource is being used by a pci device */385 if (pci_uses_irq(dev, *irq))386 return 0;387 388 /* check if the resource is already in use, skip if the389 * device is active because it itself may be in use */390 if (!dev->active) {391 if (request_irq(*irq, pnp_test_handler,392 IRQF_PROBE_SHARED, "pnp", NULL))393 return 0;394 free_irq(*irq, NULL);395 }396 397 /* check for conflicts with other pnp devices */398 pnp_for_each_dev(tdev) {399 if (tdev == dev)400 continue;401 for (i = 0;402 (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));403 i++) {404 if (tres->flags & IORESOURCE_IRQ) {405 if (cannot_compare(tres->flags))406 continue;407 if (tres->start == *irq)408 return 0;409 }410 }411 }412 413 return 1;414}415 416#ifdef CONFIG_ISA_DMA_API417int pnp_check_dma(struct pnp_dev *dev, struct resource *res)418{419 int i;420 struct pnp_dev *tdev;421 struct resource *tres;422 resource_size_t *dma;423 424 dma = &res->start;425 426 /* if the resource doesn't exist, don't complain about it */427 if (cannot_compare(res->flags))428 return 1;429 430 /* check if the resource is valid */431 if (*dma == 4 || *dma > 7)432 return 0;433 434 /* check if the resource is reserved */435 for (i = 0; i < 8; i++) {436 if (pnp_reserve_dma[i] == *dma)437 return 0;438 }439 440 /* check for internal conflicts */441 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {442 if (tres != res && tres->flags & IORESOURCE_DMA) {443 if (tres->start == *dma)444 return 0;445 }446 }447 448 /* check if the resource is already in use, skip if the449 * device is active because it itself may be in use */450 if (!dev->active) {451 if (request_dma(*dma, "pnp"))452 return 0;453 free_dma(*dma);454 }455 456 /* check for conflicts with other pnp devices */457 pnp_for_each_dev(tdev) {458 if (tdev == dev)459 continue;460 for (i = 0;461 (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));462 i++) {463 if (tres->flags & IORESOURCE_DMA) {464 if (cannot_compare(tres->flags))465 continue;466 if (tres->start == *dma)467 return 0;468 }469 }470 }471 472 return 1;473}474#endif /* CONFIG_ISA_DMA_API */475 476unsigned long pnp_resource_type(struct resource *res)477{478 return res->flags & (IORESOURCE_IO | IORESOURCE_MEM |479 IORESOURCE_IRQ | IORESOURCE_DMA |480 IORESOURCE_BUS);481}482 483struct resource *pnp_get_resource(struct pnp_dev *dev,484 unsigned long type, unsigned int num)485{486 struct pnp_resource *pnp_res;487 struct resource *res;488 489 list_for_each_entry(pnp_res, &dev->resources, list) {490 res = &pnp_res->res;491 if (pnp_resource_type(res) == type && num-- == 0)492 return res;493 }494 return NULL;495}496EXPORT_SYMBOL(pnp_get_resource);497 498static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)499{500 struct pnp_resource *pnp_res;501 502 pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);503 if (!pnp_res)504 return NULL;505 506 list_add_tail(&pnp_res->list, &dev->resources);507 return pnp_res;508}509 510struct pnp_resource *pnp_add_resource(struct pnp_dev *dev,511 struct resource *res)512{513 struct pnp_resource *pnp_res;514 515 pnp_res = pnp_new_resource(dev);516 if (!pnp_res) {517 dev_err(&dev->dev, "can't add resource %pR\n", res);518 return NULL;519 }520 521 pnp_res->res = *res;522 pnp_res->res.name = dev->name;523 dev_dbg(&dev->dev, "%pR\n", res);524 return pnp_res;525}526 527struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,528 int flags)529{530 struct pnp_resource *pnp_res;531 struct resource *res;532 533 pnp_res = pnp_new_resource(dev);534 if (!pnp_res) {535 dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);536 return NULL;537 }538 539 res = &pnp_res->res;540 res->flags = IORESOURCE_IRQ | flags;541 res->start = irq;542 res->end = irq;543 544 dev_dbg(&dev->dev, "%pR\n", res);545 return pnp_res;546}547 548struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,549 int flags)550{551 struct pnp_resource *pnp_res;552 struct resource *res;553 554 pnp_res = pnp_new_resource(dev);555 if (!pnp_res) {556 dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);557 return NULL;558 }559 560 res = &pnp_res->res;561 res->flags = IORESOURCE_DMA | flags;562 res->start = dma;563 res->end = dma;564 565 dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);566 return pnp_res;567}568 569struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,570 resource_size_t start,571 resource_size_t end, int flags)572{573 struct pnp_resource *pnp_res;574 struct resource *res;575 576 pnp_res = pnp_new_resource(dev);577 if (!pnp_res) {578 dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",579 (unsigned long long) start,580 (unsigned long long) end);581 return NULL;582 }583 584 res = &pnp_res->res;585 res->flags = IORESOURCE_IO | flags;586 res->start = start;587 res->end = end;588 589 dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);590 return pnp_res;591}592 593struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,594 resource_size_t start,595 resource_size_t end, int flags)596{597 struct pnp_resource *pnp_res;598 struct resource *res;599 600 pnp_res = pnp_new_resource(dev);601 if (!pnp_res) {602 dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",603 (unsigned long long) start,604 (unsigned long long) end);605 return NULL;606 }607 608 res = &pnp_res->res;609 res->flags = IORESOURCE_MEM | flags;610 res->start = start;611 res->end = end;612 613 dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);614 return pnp_res;615}616 617struct pnp_resource *pnp_add_bus_resource(struct pnp_dev *dev,618 resource_size_t start,619 resource_size_t end)620{621 struct pnp_resource *pnp_res;622 struct resource *res;623 624 pnp_res = pnp_new_resource(dev);625 if (!pnp_res) {626 dev_err(&dev->dev, "can't add resource for BUS %#llx-%#llx\n",627 (unsigned long long) start,628 (unsigned long long) end);629 return NULL;630 }631 632 res = &pnp_res->res;633 res->flags = IORESOURCE_BUS;634 res->start = start;635 res->end = end;636 637 dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);638 return pnp_res;639}640 641/*642 * Determine whether the specified resource is a possible configuration643 * for this device.644 */645int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,646 resource_size_t size)647{648 struct pnp_option *option;649 struct pnp_port *port;650 struct pnp_mem *mem;651 struct pnp_irq *irq;652 struct pnp_dma *dma;653 654 list_for_each_entry(option, &dev->options, list) {655 if (option->type != type)656 continue;657 658 switch (option->type) {659 case IORESOURCE_IO:660 port = &option->u.port;661 if (port->min == start && port->size == size)662 return 1;663 break;664 case IORESOURCE_MEM:665 mem = &option->u.mem;666 if (mem->min == start && mem->size == size)667 return 1;668 break;669 case IORESOURCE_IRQ:670 irq = &option->u.irq;671 if (start < PNP_IRQ_NR &&672 test_bit(start, irq->map.bits))673 return 1;674 break;675 case IORESOURCE_DMA:676 dma = &option->u.dma;677 if (dma->map & (1 << start))678 return 1;679 break;680 }681 }682 683 return 0;684}685EXPORT_SYMBOL(pnp_possible_config);686 687int pnp_range_reserved(resource_size_t start, resource_size_t end)688{689 struct pnp_dev *dev;690 struct pnp_resource *pnp_res;691 resource_size_t *dev_start, *dev_end;692 693 pnp_for_each_dev(dev) {694 list_for_each_entry(pnp_res, &dev->resources, list) {695 dev_start = &pnp_res->res.start;696 dev_end = &pnp_res->res.end;697 if (ranged_conflict(&start, &end, dev_start, dev_end))698 return 1;699 }700 }701 return 0;702}703EXPORT_SYMBOL(pnp_range_reserved);704 705/* format is: pnp_reserve_irq=irq1[,irq2] .... */706static int __init pnp_setup_reserve_irq(char *str)707{708 int i;709 710 for (i = 0; i < 16; i++)711 if (get_option(&str, &pnp_reserve_irq[i]) != 2)712 break;713 return 1;714}715 716__setup("pnp_reserve_irq=", pnp_setup_reserve_irq);717 718/* format is: pnp_reserve_dma=dma1[,dma2] .... */719static int __init pnp_setup_reserve_dma(char *str)720{721 int i;722 723 for (i = 0; i < 8; i++)724 if (get_option(&str, &pnp_reserve_dma[i]) != 2)725 break;726 return 1;727}728 729__setup("pnp_reserve_dma=", pnp_setup_reserve_dma);730 731/* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */732static int __init pnp_setup_reserve_io(char *str)733{734 int i;735 736 for (i = 0; i < 16; i++)737 if (get_option(&str, &pnp_reserve_io[i]) != 2)738 break;739 return 1;740}741 742__setup("pnp_reserve_io=", pnp_setup_reserve_io);743 744/* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */745static int __init pnp_setup_reserve_mem(char *str)746{747 int i;748 749 for (i = 0; i < 16; i++)750 if (get_option(&str, &pnp_reserve_mem[i]) != 2)751 break;752 return 1;753}754 755__setup("pnp_reserve_mem=", pnp_setup_reserve_mem);756